Skiving-machine.



G. H. DIEHL, JR. SKIVING MACHINE. APPLICATION FILED NOV. 7, 1908.

Patented Feb .to' the accompanying drawings, forming a chines for skiving and 'tively driven through driving means of usual 'ithe upper limb of this annular knife is :moupgted a presser foot, not shown in the UnITED STATES. PATENT onrion.

enonen H. mean, an, or mawronx, N.- Y.

SKIVING-MACHINE.

Specification of Letters Patent. Application filed November .7, 1908. Serial No.

Patented Feb. 15, 1910.

To all whom it may concrn:-

Be it known-that I, GEORGE H. DinnL, Jr., a citizen. of the United States, residing in the borough of Manhattan of the city of New "ork, in the State of New York, have in-' vented certain new and useful Improvements in Skiving-Machines, &c.', of Which the following is a specification, reference being had part hereof.

This invention relates generally to masplitting leather, etc, in which a rotary annular knife is employed, and it relates more particularly to the means for supporting and adjusting the feed roller which cooperates with the knife. One object of the invention is to provide for such location and relation of the feed roller with respect to the cutting edge of the annular knife as to overcome some of the difiiculties which have been incidental tothe use of machines of this character, and another object is to improve the structure of the devices by which the feed roller is sup- )orted with a. view to securing greater eficiency and convenience in the operation of the machine.

The invention will be more fully explained hereinafter with reference to the accompanying drawings in which itis illustrated, and in which- Y Figure l'is a view, partly in plan and partly in horizontal section, of so much of a skiving machine to which the invention 18 applied as is necessary to enable the invention to be understood. Fig. 2 is a view of the same in front elevation, with the frame of the. machine partly broken away. Fig. 3 a detail view of the mechanism shown in Figs. 1 and 2, partly in elevation as seen from the right and partly in section.

A skiving machine of the general character of that to which the invention is applied, as shown in the drawings, comprises an annular knife a which is mounted upon a suitable frame b to rotate at high speed. Above drawings, and immediately below the same and upon the opposite side of the knife edge, is ins-united the feed roller 0, which is pas];

character and therefore not necessary to be shown herein, such driving means, as is well i I l understood. being of such rharaeter as to .ried by the fr'ameb.

cutting edge of theknife the latter having a threaded stem, as shown in Figs. 1 and 3, so "as to per'mitgof easy adjustment. The pivot points a and c engage the ends of a cross-head f which is carried by a rock shaft g, the latter, in turn, being mounted between pivot points 9 and 9 car- A lever h, pivoted on the rock shaft g, bears at one end against an adjusting screw IL mounted in an arm'h of the rock shaft g, while its other end forms an adjustable point of support fora spring It, the other end of the spring being connected to the swinging bracket 6 at a oint about midway between its ends. An adjusting screw 5, mounted in an arm z" of the rock shaft g, provides an ustable sto against which the swinging bracket e is held by the spring /z Anarm is of the rock shaft g carries an adjusting screw is which bears against the frame 6, and also carries, loosely, an adjusting screw k which engages a nut is secured in the end of a spring k, the other end of which is as at it v It will now be understood that the adjustment of the screw z' the swinging bracket e is rocked about its axis to swing the roller toward or from the cutting edge of thedrnife, and that the pressure with which the feed roller 0 is held toward the is regulated, independently of the position of the knife, through adjustment of the tension of'the spring it by the adjusting screw it and lover it. much as the adjustin screw, lever and spring are carried by tlie rock shaft g and moved with. it, the adjustmentof the roller with respect to the rock shaft and the adjustment of the tension of the spring are, not affected by the movement oflthe rock shaft, as would be the case, forekamplqif the spi-"ing and adjusting screw Werecarricd V by up frame of the n1achinfe.- Moreover, it

iivilli'be seen that the axisofihe feed roller carrier or swinging hracketi ekabout which the feed roller is nun-" d by the combined through liloreover, it will be seen that inas action of the adjusting screw 2' and the spring k intersects the transverse plane of the cutting edge of the knife ata point below the effective working surface of Y the roller(by,\ vl 1ich expression reference is made to that portion of'the periphery of the roller which is directly beneath the cutting edge of the knife and in contact with the leather when the machine is in operation) or toward the center of rotation of the knife, as clearly shown by the broken line, in Fig. 3, and also at a point to the right of or beyond the end of the feed roller, as clearly shown by dotted lines in Figs. 1 and 2. *This relative 'disposition of the axis of movement of the feed roller with respect to the edge of the knife and the feed roller itself is found to secure substantial advantages in-the operation of the machine, especially oyer machines in which such axis intersects the cutting edge of the the pla'heof the end of the feed-roller, as" eli asover machines in which such axis intersects the axis of the feed roller itself. Thus, when theaxis of the carrier intersects the transverse plane of the cutting edge of the knife between the axis of the feed roller and the edge of the cutting knife, but nearer the latter and beyond or to-the right of the end of the feed roller, it is possib e to make a perfect skive at the right hand end of the feed roller,

thus permitting thefull width of the feed roller to be used and also permitting the right hand portion of the feed roller to be used in making a narrow skiving; whereas, if theaxis should intersect the knife edge in the plane of the end of the feed roller, it won d be impossible to make a skiving at the right hand end of the roller. The improve machine is, therefore, more flexible and convenient in operation. Again, when such axis intersects the cutting edge of the knife it is found that an abrupt shoulder is apt to be formed in the'leather at the right hand edge of the skiving, whereas, if such 'axis intersects the transverse plane'of the cutting edge somewhat within the cutting edge, then it is possible to obtain a more unlform bevel without the formation of such a shoulder. .Still again, it is obvious that when the axis intersects the edge of the knife in the plane of the end of the roller, there is no possibility of yielding to accommodate an increased thickness of stock between the roller and the edge of the knife without causing a bodil movement of the roller about the axis 0 the rock shaft g; whereas, when the axis of the carrier intersects the transverse plane of the edge of the knife somewhat wlthin the ed e of the knife, there is less rigidit and increase of thickness of stock may e accommodated without requiring movement of the feed roller about the axis of the'rock shaft 9.

"Furthermore, it is found in practice that carrier for the feed roller when the axis the feed roller carrier iii-1' tersects the plane of the transverse edge of .the knife at a point, below-or within the. effective WOIklIli surfae of the feed roller, 1

e center of rotation .of the-- reduced as compared with former construc- 'tions. In practice, witha machine running at high speed and worked to its capacity, these advantages of operation become of substantial importance,contributing as they do to the efliciency of the machine. It will also be seen that the support of the carrierby both points uponthe cross-head f involves less friction and less wear and tear than if a carrier shaft were extended through a shaft bearing in the cross-head 5 and renders adjustment and replacement of parts much easier. It will also be-unde stood that bodily adjustment of the feed roller, in a plane parallel with the axis of the annular knife, about the axis of the rock shaft 9, is effected bythe cotiperation'of the adjusting screw'k' and the spring la and that regulationof the tension of the s ring can be effected independently of the a justment of the position of the feed roller through the provision of an independent adjusting screw for the spring 7:; It will,

be noted, furthermore, with respect to the yoke shape of the'carrier e that it permits the application of the spring it to the car rier about midway between its ends so agar there is no tendency to twist the carrier and to make its movement hard upon its bearin'gs, as would be the case if a carrier shaft were provided at one end with an arm to whieh the spring were attached.

- I claim as'niy inventionu 1. .In a skiving machine,,tlie combinatio of an annular knife, a feed roller, and a ca rier for said feed roller mounted to swin about an axis which, when extended, will tersect the transverse plane of the cutti ed e of the knife between the axis of e =rol er and the effective working surface f the roller and surface' I 2. Ina skiving machine the combinatirln nearer such effective working rier for said feed roller mounted to swi aboutan axis which, extended, intersects t e transverse plane of the cutting edge of t e knife between the plane of the axis of t e .of an annular knife, a feed roller, and a ca I roller and the edge of the knife but nearer 4 i the latter and at a substantial distance fr the end of the roller. l

3. In a skiving machine,"-the combination of an annular knife, a feed roller, 2. 'r shaft having a cross-head and a yoke-l ke points to engage said cross-head.

having pivot I iso of an annular knife a feed roller, a rock shaft, a carrier for 5. In a skiving machine the combination of an annular knife, a feed roller, a rock shaft, a swinging 'carrier mounted on the rock shaft, a' n adjusting screw mounted in an arm on the rock'shaft and arranged to limit the swinging movement of the carrier, a spring connected with the carrier, a lever mounted on the rock shaft and having one end connected to said spring, and an adjusting screw mounted in an arm of the rock shaft and arranged to bear against the other end'of the lever. v

6. In a skiving machine the combination of anannular knife,a feed roller, a rock shaft having a cross-head, a'yoke-like carrier for the feed roller having pivot points for engagement with the cross-head, an ad- I i a I justing screw to limit the movement of the carrier, a spring connected to the carrier at a point substantially between its ends and out of the line of the cross head, and adjusting means for said spring.

7. In a skiving machine the combination of an annular knife, a feed roller, a rock shaft having a cross-head, a carrier for the vroller mounted on said cross-head, an arm extended from said rock shaft, an adjusting screw carried by said arm and arranged to bear against a fixed abutment, a spring connected at one end to a fixed support, and a second adjusting screw carried by the arm but independent of the first named adjusting screw and engaging the spring.

"This specification signed and witnessed this 6th day of November, A. D., 1908.

GEORGE. n. DIEHL, JR.

Signed in the presence of ELLA J. KRUGER, AMBROSE L. OSnm 

